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@midlife has a good suggestion you could also try getting a grout rake and raking out the horizontal lines between the tiles and re-grouting with a light grey or cream grout that is closer in colour to the mosaics.
If you put tiles on top of tiles like you are suggesting you are inviting water penetration problems down the line.
Only a couple of packs and can't source more.
Mrs' suggestion (now we are where we are) which is better than mine is that we have a horizontal row of three mosaics (one of each colour) covering each join with the centre point obviously being the grey tile grout lines either side - as below. I wonder if this is the best of a bad bunch suggestion.